How to increase "low aerobic" load?

My "load focus" is always horrendously low in the "low aerobic" category. But I don't understand how I can possibly increase it.

For example, my January load focus says:

Anaerobic: 149 (right in the middle of the optimal range)
High Aerobic: 692 (waaaay over the optimal range)
Low Aerobic: 15 (waaaaaaaaaaay below the optimal range)

This month, I have done everything from running several 5k's, to mountaineering, to casual hikes with my son.

This last weekend, I did an 11 mile hike, with an average HR of 100. How many Low Aerobic load points did I get for that? 3.

How the heck am I supposed to get my Low Aerobic points up to > 100 when it only gives me 3 points for a 10 mile hike? Am I supposed to do 270 more miles of hiking?

I did a 2 mile light jog yesterday, and got like 100 High Aerboic load points, and 0 Low Aerobic points. So if walking gets me almost no points, and jogging only gets my High Aerobic points, the result is I'm perpetually "severely" low on Low Aerobic points.